Liquid-fuel burner of the injection type



D. R. BRUCE LIQUID mm, BURNER OF THE mmcnou TYPE [Mani/0r,- Robertson/Mute by Hi Filed Oct.

May 27 1924.

Patented May 27, 1924.

" mans ICE.

DAVID ROBERTSON BRUCE, OF LONDON, ENGLAND.

LIQUID-FUEL BURNER OF THE INJECTION TYPE.

Application filed October 21, 1921.

To all whom it may concern:

Be it known that 1, DAVID ROBERTSON BRUCE, a subject of the King of Great Britain, residing in London, England, have invented certain new and useful Improve ments in Liquid-Fuel Burners of the Injection Type, of which the following is a specification.

This invention relates to improvements in liquid fuel burners of the injection type in which hydrocarbon fuel is mixed with air or other desired fluid and injected into a furnace or the like.

According to the invention the burner is so arranged that the compressed air or other fluid is admitted to the burner between the fuel reservoir and the nozzle, the latter having twoseparate passages, one for the fuel and one for the 'air or other fluid, the mixing taking place at the point of issue ofthe passages at the delivery end of the nozzle. The fuel reservoir may be provided with a suitable valve adapted to maintain a constant level of fuel therein, or a sight gauge may be provided and the fuel regulated by hand for example.

In .a suitable construction according to the invention the burner comprises two separate chambers preferably formed in a single casting. One chamber carries the 'burner nozzle and has a suitable fluid opening within which said nozzle is arranged and by which it is surrounded, said latter chamber being adapted to be placed in communication with the pressure fluid. The second chamber serves as a fuel chamber and is fitted with a float operated valve for regulating the supply of fuel and communicates with the pressure'chamber through a valve controlled opening and also with the burner nozzle and with the fuel supply. 1

The burner nozzle is provided with two inclined passages meeting at or about the extreme tip of the nozzle, and is mounted 'on a tube which opens into the fuel chamber above the level of the fuel therein. One passage in the nozzle is connected by a pipe with the fuel in the fuel chamber, the other passage being free and communicating with the fuel chamber through the burner tube.

With all the above described'con struction,

on admitting the pressure fluid to the pressure chamber and opening the valve a portion of the pressure fluid passes into the fuel chamber forcing the fuel through the fuel Serial No. 509,291.

to the accompanying drawing in which Fig.

1 is a longitudinal vertic'alsectional elevation of a burner constructed according to one form of the invention.

Fig. 2 is a section on the line 22 Fig. 1.

As shewn in the drawing, the burner comprises two chambers 1, 2, preferably formed in a single casting, the chamber 1- being'the fluid pressure chamber and chamber 2 the fuel chamber. The chamber 1 is provided with an opening 8 for the fluid pressure, a fluid opening 4, and an orifice 5 communicating with chamber 2' controlled by a valve 6, the'latter being here shewn as a mushroom valve positively operated by a rod 7 screwthreaded at'8 androtatable in the wall of chamber 2 by means of a knob 9. 'The burner nozzle 10is mounted on a tube 11, the otherend of which is seated in the walldividing the two chambers and opens into the fuel chamber 2. Two inclined passages 12,

13, are provided in-the nozzle, meeting at a point adjacent to the extreme tip of the nozzle.

The passage 12 is for fuel and is con-' nected with the fuel chamber-2 by a pipe 14 having a depending portion which dips below the surface of the fuel in chamber 2. The passage 13 isfor pressure fluid and is freely in communication with chamber 2 through the tube 11. A closure plate 26 scerwed into chamber 1 and having a central opening surroundingthe nozzle is preferably provided. v

The fuel chamber 2 is fittedwi-th a cover 15 having an inlet 16 for the fuel terminating in a tube 17 extending down into'the chamber and opening at its lower end into .a hollow flanged plug l8having two lateralslots 19 forthe passage of the fuel.

The flow of fuel through the slots 19 is regulated by a sleeve 20s1idably mounted on the plug 18 and pivotedat two points 21 to a carrier ring 22, the latter being pivoted .t two points 23 to two stays 2a attached '0 the float 25 slidably mounted on the tube 17. The pivot points 21, 23, are so POS1' tioned that they form a gimbal suspension for the sleeve 20 which prevents jamm ng of the sleeve if the apparatus is \vorlnng with the fuel chamber in an inclined position. The operation of the above described apparatus is as follows I Pressurefluid being admitted to chamber 1 through opening 3, the valve 6 being open the course of the pressure fluid is as 1n d1- cated by the arrows, that is to say, a portlon of the fluid passes through the opening l surrounding the nozzle, a further portion passing through the valve 6 into chamber 2 and along tube 11 through the passage 13 in the nozzle. The admission of pressure fluid to chamber 2 causes the fuel to be forced through the pipe 14 and through the passage 12 in the nozzle. The float 25 movesaccording to the fluctuations of the fuel level in the chamber 2 causing the sleeve 20* to cover or uncover the slots 19 in the tube 17 and thus regulating the fuel supply aswill be readily understood. If the fluid pressure is cut off from chamber 2, the fuel at once supplyto the burner nozzle ceases and the float rising on tube 17 cuts off thefuel supply to the chamber 2 as soon as it rises sufficiently to cause the sleeve 20 tocover the slots 19 completely.

It will be obvious that various arrangements of float operated valve may be em:- ployed in the fuel chamber 2. lit is importaut that the fuel supply valve should be so adjusted that entry of fuel into the burner tube. 11 is prevented. Further the depend-- ing end of tube 1d preferably extends down nearly to the bottom of the fuel chamber.

As here shown the various portions of the burner may be readily detached and replaced, the burner nozzle and the tube 11 being attached by screwing, the plate 26 surrounding the nozzle, and the tube 1% being readily removable. Further the cover 15 is preferably held down by suitable screws and on removal carries with it the whole of the float operated valve mechanism.

Having thus described the nature of my said invention and the best means I know of carrying the same into practical effect I claim 1. A liquid fuel burner having a fluid pressure chamber provided with a fluid opening, a nozzle arranged in and surrounded by said opening provided with two independent inclined passages meeting substantially at the tip of said nozzle, liquid fuel being admitted t one passage and pressure fluid to the other and to said fluid opening so that admixture of the fuel and the pressure fluid takes place substantially at the tip of the nozzle.

2. A liquid fuel burner having a fluid pressure chamber prov1ded with a hunt passages meeting substantially at the tip of said nozzle, a fuel reservoir having valve controlled communication with said fluid pressure chamber, a float operated valve for regulating the level of fuel in said reservoir. means to direct liquid fuel from said reservoir to one of said inclined passages, and means to supply pressure fluid from said fuel reservoir to the other of said inclined.

passages.

3. A. liquid fuel burner having a fluid pressure chamber provided with a fluid openine, a burner nozzle arranged in said fluid pressure chamber, surrounded by said opening, said nozzle being provided with two independent passages meeting substantially at the tip of said nozzle, a fuel chamber, and a valve interposed between said pressure fluid chamber and said fuel chamber, to permit pressure fluid to pass into the fuel chamber to force fuel and fluid therefrom through the passages in said nozzle t the combustion chamber thereof.

4-. A liquid fuel burner comprising a fuel reservoir provided with a tube through which fuel is admitted from the source of supply, the end of said tube within the chamber terminating in a hollow plug); portion having a fuel opening or openings in the side thereof, a float, a sleeve slidable on said plug" portion and pivotally attached to said float, said float being operated by the fluctuations of the fuel level for controlling by means of said sleeve the passage of fluid through the opening in said plug portion.

In a liquid burner, a fuel. tube having; at least one fuel openin in the side thereof, a float and a sleeve t slide over said fuel opening and control the flow of liquid there- 'through, said sleeve being freely suspended from and movable with said float by means including a gimbal.

6. A liquid fuel. burner of the injection type having; a fuel chamber, a fluid pressure chamber communicating with sai'd fuel chamber. a burner nozzle arranged in said fluid pressure chamber in communication with said fuel chamber and a valve to control the admission of fluid under pressure from said fluid pressure chamber to said fuel chamber whereby the supply of fuel and fluid to said nozzle may be regulated.

7. A. liquid burner comprising a fuel reservoir, a fuel supply tube terminating in a hollow plug provided with at least one fluid opening in the side thereof, a float slidable on said tube, a sleeve slidable on said plug to regulate the flow of fuel through said opening and gimbal suspension means between said float and saidsleeve to effect the transmission of movements of said float Sill Lilli produced by fluctuations of the fuel level to said sleeve to control the passage of fluid through said opening.

8. A liquid fuel burner having a nozzle provided with independent passages for fuel and fluid meeting substantially at the tip thereof. a fuel reservoir having passages communicating with the fuel and fluid passages of said nozzle respectively with the 10 lower and upper portions of said fuel reservoir, a pressure fluid chamber having a fluid discharge opening surrounding said nozzle and valve controlled communication between said fluid chamber and said fuel chamber to regulate the supply of fluid under pressure to force fuel and fluid respec tively to said nozzle.

In testimony whereof I have signed my name to this specification.

DAVID ROBERTSON BRUCE. 

